Anmelden

Open Access

  • Startseite
  • Suchen
  • Browsen
  • Veröffentlichen
  • Hilfe

Filtern

Autor*in

  • Gollwitzer, Christian (25)
  • Bellon, Carsten (5)
  • Deresch, Andreas (5)
  • Ewert, Uwe (5)
  • Jaenisch, Gerd-Rüdiger (5)
  • Bruno, Giovanni (3)
  • Oesch, Tyler (3)
  • Thiede, Tobias (2)
  • Ulbricht, Alexander (2)
  • Weise, Frank (2)
+ weitere

Erscheinungsjahr

  • 2020 (2)
  • 2019 (6)
  • 2018 (4)
  • 2017 (3)
  • 2015 (1)
  • 2014 (1)
  • 2012 (5)
  • 2011 (3)

Dokumenttyp

  • Zeitschriftenartikel (8)
  • Beitrag zu einem Tagungsband (7)
  • Vortrag (7)
  • Posterpräsentation (3)

Sprache

  • Englisch (21)
  • Deutsch (4)

Referierte Publikation

  • nein (17)
  • ja (8)

Schlagworte

  • Synchrotron (5)
  • Radiographie (4)
  • Simulation (4)
  • Absorption edge (3)
  • BAMline (3)
  • MOF (3)
  • Probability of detection (3)
  • Tomography (3)
  • X-ray imaging (3)
  • Absorption edge tomography (2)
+ weitere

Organisationseinheit der BAM

  • 8 Zerstörungsfreie Prüfung (16)
  • 8.5 Mikro-ZfP (15)
  • 6 Materialchemie (4)
  • 6.3 Strukturanalytik (4)
  • 7 Bauwerkssicherheit (2)
  • 7.1 Baustoffe (2)
  • 8.3 Radiologische Verfahren (2)
  • 1 Analytische Chemie; Referenzmaterialien (1)
  • 1.2 Biophotonik (1)
  • 8.2 Zerstörungsfreie Prüfmethoden für das Bauwesen (1)
+ weitere

25 Treffer

  • 1 bis 10
  • CSV
  • RIS
  • 10
  • 20
  • 50
  • 100

Sortieren nach

  • Jahr
  • Jahr
  • Titel
  • Titel
  • Autor*in
  • Autor*in
Reference materials and representative test materials to develop nanoparticle characterization methods: the NanoChOp project case (2015)
Roebben, G. ; Kestens, V. ; Varga, Z. ; Charoud-Got, J. ; Ramaye, Y. ; Gollwitzer, Christian ; Bartczak, D. ; Geißler, Daniel ; Noble, J.E. ; Mazoua, S. ; Meeus, N. ; Corbisier, P. ; Palmai, M. ; Mihály, J. ; Krumrey, M. ; Davies, J. ; Resch-Genger, Ute ; Kumarswami, N. ; Minelli, C. ; Sikora, A. ; Goenaga-Infante, H.
This paper describes the production and characteristics of the nanoparticle test materials prepared for common use in the collaborative research project NanoChOp (Chemical and optical characterization of nanomaterials in biological systems), in casu suspensions of silica nanoparticles and CdSe/CdS/ZnS quantum dots (QDs). This paper is the first to illustrate how to assess whether nanoparticle test materials meet the requirements of a "reference material" (ISO Guide 30, 2015) or rather those of the recently defined category of "representative test material (RTM)" (ISO/TS 16195, 2013). The NanoChOp test materials were investigated with small-angle X-ray scattering (SAXS), dynamic light scattering (DLS), and centrifugal liquid sedimentation (CLS) to establish whether they complied with the required monomodal particle size distribution. The presence of impurities, aggregates, agglomerates, and viable microorganisms in the suspensions was investigated with DLS, CLS, optical and electron microscopy and via plating on nutrient agar. Suitability of surface functionalization was investigated with attenuated total reflection Fourier transform infrared spectrometry (ATR-FTIR) and via the capacity of the nanoparticles to be fluorescently labeled or to bind antibodies. Between-unit homogeneity and stability were investigated in terms of particle size and zeta potential. This paper shows that only based on the outcome of a detailed characterization process one can raise the status of a test material to RTM or reference material, and how this status depends on its intended use.
Spectral characterization of storage phosphor imaging plates (2014)
Deresch, Andreas ; Jechow, Mirko ; Gollwitzer, Christian
This work presents attenuation and sensitivity measurements of radiographic imaging plates (IPs) with quasimonoenergetic X-rays in the 8–60 kiloelectronvolt range. The measurements are used to validate theoretical predictions. A short overview of the theoretical model is given. The model can be used to describe the sensitivity of different detector types to a wide range of X-ray energies.
Radiographic simulator aRTist: version 2 (2012)
Bellon, Carsten ; Deresch, Andreas ; Gollwitzer, Christian ; Jaenisch, Gerd-Rüdiger
Computer simulation of radiography can be used for different purposes in NDT, such as qualification of NDT systems, optimization of radiographic parameters, feasibility analysis, model-based data interpretation, and training of NDT/NDE personnel. BAM has been working on modeling in the field of radiographic testing for many years. With the gathered theoretical background and the familiarity with practical requirements of industrial application the simulation software aRTist has been developed. This analytical simulator includes a description of the radiation source, the interaction of radiation with test pieces and flaws, and the detection process with special focus on film and digital industrial radiology. It features high processing speed with nearinteractive frame rates and a high level of realism. Here we focus on the recent developments of the simulator, notably the release of aRTist version 2. Extended functionality regarding automated virtual computed tomography now allows for arbitrary scan paths. Another program extension supports reliability investigations and provides a user interface for planning automatic simulations with varying parameters and defects.
Reliability investigations of radiographic testing using aRTist as a simulation tool (2012)
Gollwitzer, Christian ; Bellon, Carsten ; Deresch, Andreas ; Jaenisch, Gerd-Rüdiger ; Baron, H.-U. ; Ewert, Uwe
Within the framework of the European project PICASSO, the radiographic simulator aRTist (analytical Radiographic Testing inspection simulation tool) developed by BAM has been extended for reliability assessment of film and digital radiography. A simulation supported probability of detection (POD) methodology has been developed and the validity of the approach has been studied using an application from the aeronautics industry. An experimental POD has been determined with the help of a specialized software tool, developed to aid with the collection of large series of POD data. The resulting POD is compared to simulations of the same setting using aRTist and the newly available module for simulation supported POD. A quantitative agreement within a few percent is achieved between the experimental and the simulation supported POD.
On POD Estimations with Radiographic Simulator aRTist (2011)
Gollwitzer, Christian
On POD estimations with radiographic simulator aRTist (2011)
Gollwitzer, Christian ; Bellon, Carsten ; Deresch, Andreas ; Ewert, Uwe ; Jaenisch, Gerd-Rüdiger
The computer simulation of radiography is applicable for different purposes in NDT such as for the qualification of NDT systems, the optimization of system parameters, feasibility analysis, model-based data interpretation, education and training of NDT/NDE personnel, and others. Within the framework of the European project PICASSO simulators will be adapted to support reliability assessments of NDT tasks. The radiographic simulator aRTist developed by BAM is well suited for this task. It combines analytical modelling of the RT inspection process with the CAD-orientated object description applicable to various industrial sectors such as power generation, aerospace, railways and others. The analytic model includes the description of the radiation source, the interaction of Radiation with the material of the part, and the detection process with special focus to DIR. To support reliability estimations the simulation tool is completed by a tool for probability of detection (POD) estimation. It consists of a user interface for planning automatic simulation runs with varying parameters, specifically defect variations. Further, an automatic image analysis procedure is included to evaluate the defect visibility and calculate the POD therefrom.
Simulation of complex scan paths for 3D reconstruction (2011)
Bellon, Carsten ; Gollwitzer, Christian ; Fratzscher, Daniel ; Ewert, Uwe ; Jaenisch, Gerd-Rüdiger
X-ray computed tomography (CT) is a volumetric (3D) Imaging diagnostic method, well established in the medical field, and in industrial NDE as well. Developments in industrial CT aim to extent the applicability to complex structures, which do not allow the access of all directions. This are e.g. limited view, data and angle CT applications. New reconstruction algorithms are required on one side, and the accuracy has to be improved on the other side. Numerical Simulation can support such developments by providing well defined data sets for the testing of reconstruction algorithms. This approach of virtual CT is realized within the radiographic simulator aRTist, developed by BAM. The poster shows the possibilities of this tool to consider complex scan paths. Simulated data sets have been reconstructed by an versatile backprojection algorithm.
New Requirements for Digital Radiographic Testing of Welds According to ISO Standards (2012)
Gollwitzer, Christian
Simulation supported POD for RT test case - concept and modeling (2012)
Gollwitzer, Christian ; Bellon, Carsten ; Deresch, Andreas ; Ewert, Uwe ; Jaenisch, Gerd-Rüdiger ; Zscherpel, Uwe ; Mistral, Q.
Within the framework of the European project PICASSO, the radiographic simulator aRTist (analytical Radiographic Testing inspection simulation tool) developed by BAM has been extended for reliability assessment of film and digital radiography. NDT of safety relevant components of aerospace industry requires the proof of probability of detection (POD) of the inspection. Modeling tools can reduce the expense of such extended, time consuming NDT trials, if the result of simulation fits to the experiment. Our analytic simulation tool consists of three modules for the description of the radiation source, the interaction of radiation with test pieces and flaws, and the detection process with special focus on film and digital industrial radiography. It features high processing speed with near–interactive frame rates and a high level of realism. A concept has been developed as well as a software extension for reliability investigations, completed by a user interface for planning automatic simulations with varying parameters and defects. Furthermore, an automatic image analysis procedure is included to evaluate the defect visibility. The radiographic modeling from 3D CAD of aero engine components and quality test samples are compared as a precondition for real trials. This enables the evaluation and optimization of film replacement for application of modern digital equipment for economical NDT and defined POD.
Measuring microfocal spots using digital radiography (2012)
Fry, D. ; Ewert, Uwe ; Gollwitzer, Christian ; Neuser, E. ; Selling, J.
  • 1 bis 10

OPUS4 Logo

  • Kontakt
  • Impressum
  • Sitelinks